WO2013119025A1 - Method and apparatus for selecting equivalent plmn - Google Patents

Method and apparatus for selecting equivalent plmn Download PDF

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Publication number
WO2013119025A1
WO2013119025A1 PCT/KR2013/000924 KR2013000924W WO2013119025A1 WO 2013119025 A1 WO2013119025 A1 WO 2013119025A1 KR 2013000924 W KR2013000924 W KR 2013000924W WO 2013119025 A1 WO2013119025 A1 WO 2013119025A1
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WO
WIPO (PCT)
Prior art keywords
volte
plmn
equivalent
list
terminal
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PCT/KR2013/000924
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French (fr)
Korean (ko)
Inventor
임한나
조성연
정상수
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삼성전자 주식회사
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Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Priority to KR1020147028047A priority Critical patent/KR101999153B1/en
Priority to US14/377,112 priority patent/US9432891B2/en
Priority to EP13746250.3A priority patent/EP2814287B1/en
Publication of WO2013119025A1 publication Critical patent/WO2013119025A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/20—Performing reselection for specific purposes for optimising the interference level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for selecting a PLMN equivalent to a registered Public Land Mobile Network (PLMN).
  • PLMN Public Land Mobile Network
  • PLMN Public Land Mobile Network
  • MCC mobile country code
  • MN mobile network code
  • the terminal When the terminal roams, or when the coverage of the operating network is a part of the country, but not all of the country coverage, the operator has entered into a roaming agreement with other operators so that the terminal subscribed to use the PLMN of another operator You may. That is, the terminal may perform inter PLMN handover. In order to move between the PLMNs, a PLMN that may be considered equivalent to a 'registered PLMN' currently registered by the terminal is called an equivalent PLMN.
  • the equivalent PLMN is a PLMN that the terminal treats as a registered PLMN in the PLMN selection, cell selection / reselection process.
  • the terminal delivers an equivalent PLMN list from the network in the process of attach, mixed attach, tracking area update, and mixed combined area update (TAU).
  • TAU mixed combined area update
  • the terminal stores the received equivalent PLMN list and the registered PLMN registered by the terminal together in the terminal.
  • the list stored in the terminal continues to be stored even when the terminal is turned off, and when the terminal is turned on, the list is used for PLMN selection and cell selection.
  • the list stored in the terminal is deleted in a specific situation, such as when the USIM (Universal Subscriber Identity Module) of the terminal is removed or the terminal makes an emergency call connection.
  • USIM Universal Subscriber Identity Module
  • the attach process is a process in which a terminal accesses a network
  • the mixed attach process is a process in which a terminal simultaneously accesses a packet service (PS) network and a circuit service (CS) network.
  • the tracking area update (TAU) process is a process in which a terminal changes its own tracking area (TA) or when a specific event occurs, and registers it in the network
  • the mixed TAU process is a tracking area (TA) in which the terminal is located. If is changed, it is a process of registering it to PS network and CS network at the same time.
  • the equivalent PLMN list was a form defined by an operator policy and delivered to the terminal regardless of the service the terminal wanted to receive.
  • all PLMNs in the equivalent PLMN list do not provide the same service.
  • VoIP Voice over Internet Protocol
  • the terminal may use VoIP voice over CS voice call service.
  • eNB evolved node B
  • FIG. 1 is an exemplary diagram when a UE (UE) located in PLMN1 moves to a service providing area of PLMN2 and PLMN3.
  • UE UE
  • the UE supports VoLTE and prefers to use VoLTE over CS voice calls.
  • Three PLMNs (PLMN1, PLMN2, PLMN3) are illustrated in the system of FIG.
  • the registered PLMN of the UE is PLMN1.
  • PLMN1 supports VoLTE
  • PLMN2 does not support VoLTE
  • PLMN3 supports VoLTE.
  • the MME Mobility Management Entity
  • the PLMN2 and PLMN3 may be included in the equivalent PLMN list of the PLMN1.
  • the UE when the UE UE needs to select a PLMN and / or a cell, the UE may select a PLMN2 that does not support VoLTE because the UE arbitrarily selects a PLMN in the equivalent PLMN list. In this case, the UE may not receive voice service in a manner supported or preferred by the UE.
  • the present invention has been made to solve the above problems, and relates to a method for allowing a terminal that prefers a specific service to select a PLMN supporting a specific service.
  • the present invention relates to a method of preferentially selecting a PLMN / cell supporting VoLTE when a UE supporting / prefering VoLTE performs PLMN / cell selection.
  • a method for providing a PLMN list of a mobility management entity (MME) receiving a request from a terminal, the terminal based on the request VoLTE Determining whether to prefer Voice over Long Term Evolution, and when the UE prefers the VoLTE, a modified equivalent PLMN list including information on whether each PLMN supports the VoLTE, or supporting the VoLTE
  • the method may include transmitting a VoLTE supported PLMN list including only the PLMN.
  • a method of selecting an equivalent Public Land Mobile Network (PLMN) of a user equipment (UE) wherein each PLMN is Voice over Long Term Evolution (VOLTE)
  • PLMN Public Land Mobile Network
  • VOLTE Voice over Long Term Evolution
  • each PLMN is the Voice over Long Term Receiving a modified equivalent PLMN list including information on whether or not to support Evolution), or a VoLTE-supported PLMN list including only the PLMNs supporting the VoLTE, if a PLMN selection is required for the UE that prefers VoLTE, Selecting an equivalent PLMN supporting the VoLTE based on the modified equivalent PLMN list or the VoLTE supported PLMN list and transmitting a handover required message to a target base station corresponding to the selected PLMN. It may include.
  • a mobility management entity (MME) providing a Public Land Mobile Network (PLMN) list is based on a communication unit that receives a request from a terminal and the request.
  • the method may include determining whether the UE prefers Voice over Long Term Evolution (VOLTE).
  • VOLTE Voice over Long Term Evolution
  • the communication unit may transmit a modified equivalent PLMN list including information on whether each PLMN supports the VoLTE, or a VoLTE support PLMN list including only the PLMN supporting the VoLTE. Can be.
  • each PLMN is the Voice over Long Term Evolution (VOLTE) Communication unit for receiving a modified equivalent PLMN list including information on whether or not the information is supported, or a VoLTE supported PLMN list including only the PLMN supporting the VoLTE, and the modified equivalent PLMN list or the VoLTE supported PLMN list.
  • the controller may include a controller for selecting an equivalent PLMN supporting the VoLTE.
  • each PLMN is the Voice over Long Term (VoLTE)
  • VoIP Voice over Long Term
  • a control unit for selecting an equivalent PLMN supporting the VoLTE based on the modified equivalent PLMN list or the VoLTE support PLMN list.
  • the communication unit may transmit a handover required message to a target base station corresponding to the selected PLMN.
  • a terminal that prefers to use VoLTE may effectively select an equivalent PLMN supporting VoLTE.
  • FIG. 1 is an exemplary diagram when a UE (UE) located in PLMN1 moves to a service providing area of PLMN2 and PLMN3.
  • UE UE
  • FIG. 2 is a flowchart illustrating a process of forming an equivalent PLMN * list by an MME according to the first embodiment of the present invention.
  • FIG 3 is an illustration of an equivalent PLMN * list according to the first embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating a delivery process of a PLMN * list according to a first embodiment of the present invention.
  • FIG. 5 is an exemplary diagram of a VoLTE support PLMN list according to a second embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a PLMN / cell selection process of the UE according to the third embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a PLMN / cell selection process of an eNB according to a fourth embodiment of the present invention.
  • FIG. 8 is a block diagram of a terminal 401 according to an embodiment of the present invention.
  • FIG. 9 is a block diagram of an eNB (or base station) 402 according to an embodiment of the present invention.
  • FIG. 10 is a block diagram of an MME 403 according to an embodiment of the present invention.
  • EPS Evolved Packet System
  • main subject matter of the present invention does not significantly depart from the scope of the present invention in other communication systems having a similar technical background. It can be applied to a slight modification in the range that is not, to the judgment of those skilled in the art of the present invention.
  • the MME when the MME constructs the equivalent PLMN list, the MME constructs the equivalent PLMN list according to the first embodiment of the present invention in consideration of the VoLTE preference of the UE and the VoLTE support of the eNB.
  • the equivalent PLMN list according to the first embodiment of the present invention includes whether each PLMN supports VoLTE.
  • the equivalent PLMN list according to the first embodiment of the present invention is hereinafter referred to as the equivalent PLMN * list (asterisk addition) or the first modified PLMN list.
  • the MME delivers the generated equivalent PLMN * list to the eNB and the UE.
  • the MME generates a VoLTE supported PLMN list according to the second embodiment of the present invention in consideration of the VoLTE preference of the UE and the VoLTE support of the eNB separately from the equivalent PLMN list. Suggest to do.
  • the MME delivers the generated VoLTE support PLMN list to the eNB and the UE.
  • a UE that prefers VoLTE selects a PLMN that supports VoLTE among PLMNs in the received equivalent PLMN * list or VoLTE support PLMN list.
  • the PLMN selection may include selecting a cell belonging to the PLMN.
  • the source eNB selects a PLMN that supports VoLTE among the PLMNs in the received equivalent PLMN * list or the VoLTE support PLMN list.
  • the PLMN selection may include a source eNB selecting a cell belonging to the PLMN as a target cell.
  • the PLMN selection may include a source eNB selecting an eNB managing a cell belonging to the PLMN as a target eNB.
  • FIG. 2 is a flowchart illustrating a process of forming an equivalent PLMN * list by an MME according to the first embodiment of the present invention.
  • the MME receives a request from a UE.
  • the request may include, for example, any one or more of an attach request, a mixed attach request, a TAU request, and a mixed TAU request.
  • the MME checks whether the terminal that sent the request prefers VoLTE. For example, if the request includes information indicating that the UE prefers VoLTE, it can be confirmed that the UE transmitting the request prefers VoLTE. For example, the MME may check the preference information of the terminal through 'Voice domain preference and UE's usage setting' transmitted by the terminal.
  • step 230 the MME checks whether an eNB corresponding to the terminal supports VoLTE.
  • the confirmation may be performed through a UE 'Radio Capability Match' process. According to a variant, it is assumed that all eNBs support VoLTE and step 230 may be omitted.
  • step 240 the MME creates an equivalent PLMN * list that includes the VoLTE indicator.
  • step 220 If it is determined in step 220 that the UE does not prefer VoLTE, the process proceeds to step 250. Similarly, if the UE does not prefer VoLTE, the process proceeds to step 250. In step 250, the MME generates an equivalent PLMN list in the existing method without considering VoLTE.
  • FIG 3 is an illustration of an equivalent PLMN * list according to the first embodiment of the present invention.
  • the equivalent PLMN * list includes whether each PLMN in the equivalent PLMN * list supports VoLTE.
  • the support may be indicated through a 'VoLTE support indicator for PLMN' indicator and / or a field according to the first embodiment of the present invention.
  • the VoLTE support indicator for the PLMN may consist of a 1 bit indicator. In this case, it can be set to 1 if the PLMN supports VoLTE or 0 if it does not support VoLTE.
  • the VoLTE support indicator for the PLMN may be expressed in conjunction with other information or occupy two or more bits.
  • the VoLTE support indicator for the PLMN may be used in the reverse form, such as 0 when the PLMN supports VoLTE and 1 when the PLMN does not support VoLTE.
  • FIG. 4 is a flowchart illustrating a delivery process of a PLMN * list according to a first embodiment of the present invention.
  • the PLMN * list is transmitted during the attach process.
  • the PLMN * list may be delivered during other types of processes besides the attach process or as a separate process.
  • the attach process is not directly related to the present embodiment.
  • the terminal 401 sends an attach request to the MME 403 of the network.
  • the attach request may include a VoLTE preference (preferred information, preference indicator) of the terminal 401.
  • the VoLTE preference may be indicated through the existing 'Voice domain preference and UE's usage setting'. According to a modification, a new parameter indicating VoLTE preference may be added.
  • the MME 403 transmits a UE radio capability match request to the eNB 402 corresponding to the terminal 401.
  • the MME 403 receives a UE Radio Capability Match response from the eNB 402.
  • the process of steps 420 and 430 is referred to as a UE radio capability match process.
  • the MME 403 checks whether the eNB 402 supports VoLTE through an existing UE radio performance matching process. Among the eNBs belonging to the same PLMN, some of the eNBs support VoLTE and the other eNBs may not support VoLTE.
  • the UE radio capability matching process is a process in which the MME 403 confirms radio capability of the eNB 402.
  • step 440 the MME generates an equivalent PLMN * list or an equivalent PLMN list in consideration of the preference of the terminal 401 received in step 410 and the VoTLE support of the eNB 402.
  • a detailed determination process for generating a list is as described above with reference to FIG. 2. It is assumed here that the MME 403 generates an equivalent PLMN * list.
  • step 450 the MME 403 sends an Attach Accept / Initial context setup request message to the eNB 402.
  • the attach allow / initial context setup request message contains an equivalent PLMN * list.
  • the initial context setup request / response process is a process in which the MME 403 delivers a context for the terminal 401 to the eNB 402.
  • step 460 the eNB 402 stores the equivalent PLMN * list (ie, a list including the VoLTE support information) received in step 450.
  • the eNB 402 transmits the attach permission message received in operation 450 to the terminal 401.
  • the attach allow message includes an equivalent PLMN * list.
  • step 480 the eNB 402 transmits an initial context setup response message to the MME 403.
  • the terminal 401 may receive an equivalent PLMN * list through the TAU process in addition to the attach process described with reference to FIG. 4.
  • the MME 403 may deliver the changed equivalent PLMN * list to the eNB 402 through a separate signaling message.
  • FIG. 5 is an exemplary diagram of a VoLTE support PLMN list according to a second embodiment of the present invention.
  • the MME not only delivers an existing equivalent PLMN list to UEs that prefer VoLTE, but can also additionally deliver VoLTE-supported PLMN lists.
  • the delivery of the VoLTE-supported PLMN list may be performed in a process of delivering an existing equivalent PLMN list, or may be performed through an independent non-access stratum (NAS) or S1 application protocol (S1-AP) process.
  • NAS non-access stratum
  • S1-AP S1 application protocol
  • the VoLTE Support PLMN List is a list containing only PLMNs that support VoLTE.
  • FIG. 6 is a flowchart illustrating a PLMN / cell selection process of the UE according to the third embodiment of the present invention.
  • the terminal stores the equivalent PLMN * list received from the MME or the VoLTE support PLMN list as described in the second embodiment.
  • the UE that prefers VoLTE determines that PLMN and / or cell selection is required.
  • the UE determines whether there is an equivalent PLMN supporting VoLTE. For this determination, the equivalent PLMN * list of the first embodiment or the VoLTE support PLMN list of the second embodiment may be utilized. If it is determined based on this list that there is an equivalent PLMN supporting VoLTE, the process proceeds to step 640.
  • step 640 the UE selects a PLMN and / or a cell supporting the VoLTE. If there is no equivalent PLMN supporting VoLTE, the process proceeds to step 630, where the terminal 630 selects any equivalent PLMN and / or cell.
  • the UE may preferentially check the VoLTE support PLMN list in the PLMN / cell selection process.
  • FIG. 7 is a flowchart illustrating a PLMN / cell selection process of an eNB according to a fourth embodiment of the present invention.
  • the eNB stores the equivalent PLMN * list received from the MME or the VoLTE support PLMN list as described with reference to the second embodiment.
  • the source eNB determines that PLMN and / or cell selection is required.
  • the eNB checks whether there is an equivalent PLMN supporting VoLTE based on the received equivalent PLMN * list or VoLTE support PLMN list. If there is an equivalent PLMN that supports VoLTE, the process proceeds to step 740 where the eNB selects the PLMN and / or cell that supports VoLTE. If there is no equivalent PLMN supporting VoLTE, the process proceeds to step 730 where the eNB selects any equivalent PLMN and / or cell.
  • the PLMN / cell selection process may include a process of a source eNB selecting a cell belonging to the PLMN as a target cell.
  • the PLMN selection process may include a process in which a source eNB selects an eNB managing a cell belonging to the PLMN as a target eNB.
  • the eNB delivers a HandOver required message to the target eNB supporting the selected PLMN and / or cell.
  • the terminal 401 includes a communication unit 810 and a control unit 820. Parts of the other components of the terminal 401 not directly related to the embodiments of the present invention are omitted.
  • the controller 820 controls the terminal 401 to select the PLMN by the terminal 401 according to any one of the above-described embodiments. For example, the controller 820 may perform determination / control for the process described with reference to FIG. 6.
  • the communication unit 810 transmits and receives a signal required to implement any one of the above-described embodiments.
  • the eNB 402 includes a communication unit 910 and a control unit 920. Parts of other components of the eNB 402 that are not directly related to the embodiments of the present invention are omitted.
  • the controller 920 controls the eNB 402 so that the eNB 402 selects the PLMN during the handover of the terminal 401 according to any one of the above-described embodiments. For example, the controller 920 may perform determination / control for the process described with reference to FIG. 7.
  • the communication unit 910 transmits and receives a signal necessary to implement any one of the above-described embodiments.
  • the MME 403 includes a communication unit 1010 and a control unit 1020. Parts of the other components of the MME 403 that are not directly related to the embodiments of the present invention are omitted.
  • the controller 1020 controls the MME 403 to generate the PLMN * list or the VoLTE support PLMN list when the MME 403 receives a request from the terminal 401 according to any one of the above-described embodiments. For example, the controller 1020 may perform determination / control for the process described with reference to FIG. 2.
  • the communication unit 1010 transmits and receives a signal required to implement any one of the above-described embodiments.
  • the description has focused on the preference of the VoLTE of the terminal and whether the base station / cell / PLMN supports the VoLTE.
  • embodiments of the present invention can also be applied to other preferences of the terminal and whether the corresponding support of the base station / cell / PLMN. For example, if the terminal prefers the second protocol to the first protocol when connecting the data of the terminal, a method similar to the above-described embodiments may be applied so that the terminal is connected to the base station / cell / PLMN that supports the second protocol.
  • the above-described embodiments may be implemented in the form of a program that can be driven in a computer or other electronic device, and the program may be stored in a storage medium.

Abstract

The present invention relates to a method and apparatus for selecting a Public Land Mobile Network (PLMN), and according to one embodiment of the present invention, the method for providing a PLMN of a Mobility Management Entity (MME) may comprise the steps of: receiving a request from a terminal; determining whether the terminal prefers VoLTE (Voice over Long Term Evolution) on the basis of the request; and if the terminal prefers VoLTE, transmitting an equivalent altered PLMN list that includes information on whether each PLMN supports VoLTE, or a VoLTE supporting PLMN list that includes only PLMNs supporting VoLTE. According to one embodiment of the present invention, a terminal preferring the use of VoLTE can effectively select an equivalent PLMN supporting VoLTE.

Description

동등한 ＰＬＭＮ 선택 방법 및 장치Equal PLMN Selection Method and Apparatus
본 발명은 무선 통신 시스템에 관한 것으로 더욱 상세하게는 등록된 PLMN(Public Land Mobile Network)과 동등한 PLMN을 선택하는 방법 및 장치에 관한 것이다.The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for selecting a PLMN equivalent to a registered Public Land Mobile Network (PLMN).
GSM, WCDMA, LTE등의 3GPP시스템에서 PLMN(Public land mobile network)은 통신 사업자가 운용하는 망의 식별자를 일컫는다. 상기 PLMN은 PLMN 식별자 (PLMN ID)를 통해 구별된다. PLMN 식별자는 MCC (Mobile Country Code)와 MNC (Mobile Network Code)로 구성된다. 단말이 전원을 켜면(turn on), 단말은 단말 내에 저장된 PLMN 리스트의 우선순위에 따라 PLMN을 선택하고 등록한다. 상기 등록된 PLMN을 등록된(registered) PLMN이라고 한다. 사업자는 단말이 로밍한 경우, 또는 운용하는 망의 커버리지(coverage)가 해당 국가 영역의 전부가 아닌 일부인 경우, 타 사업자들과 로밍 계약을 맺어서 상기 사업자에 가입된 단말이 타 사업자의 PLMN을 사용하도록 할 수도 있다. 즉, 단말은 PLMN 간(inter PLMN) 핸드오버 수행이 가능하다. 상기 PLMN 간 이동을 위해, 단말이 현재 등록한 '등록된 PLMN'과 동등하게 여겨질 수 있는 PLMN을 동등한(equivalent) PLMN이라 한다. In 3GPP systems such as GSM, WCDMA, and LTE, PLMN (Public Land Mobile Network) refers to the identifier of the network operated by the carrier. The PLMNs are distinguished through PLMN identifiers (PLMN IDs). The PLMN identifier consists of a mobile country code (MCC) and a mobile network code (MCN). When the terminal is turned on, the terminal selects and registers the PLMN according to the priority of the PLMN list stored in the terminal. The registered PLMN is called a registered PLMN. When the terminal roams, or when the coverage of the operating network is a part of the country, but not all of the country coverage, the operator has entered into a roaming agreement with other operators so that the terminal subscribed to use the PLMN of another operator You may. That is, the terminal may perform inter PLMN handover. In order to move between the PLMNs, a PLMN that may be considered equivalent to a 'registered PLMN' currently registered by the terminal is called an equivalent PLMN.
다시 말하면, 동등한 PLMN은 PLMN 선택, 셀(cell) 선택/재선택 과정에서 단말이 등록된 PLMN과 동등하게 취급하는 PLMN이다. LTE 시스템을 예로 들어 설명하면, 단말은 어태치(attach), 혼합된 어태치(combined attach), TAU(tracking area update), 혼합된 TAU(combined tracking area update) 과정에서 네트워크로부터 동등한 PLMN 리스트를 전달받거나, 또는 기 전달받은 동등한 PLMN 리스트를 업데이트한다. 단말은 상기 전달받은 동등한 PLMN 리스트와 단말이 등록한 등록된 PLMN을 함께 단말 내에 저장한다. 상기 단말 내에 저장된 리스트는 단말이 전원을 끄는 경우에도 계속 저장이 되어, 이후 단말이 전원을 켠 경우 PLMN 선택, 셀 선택 시에 사용된다. 상기 단말 내에 저장된 리스트는 단말의 USIM(범용 사용자 식별 모듈; Universal Subscriber Identity Module)이 제거된 경우나, 또는 단말이 응급 호 연결을 한 경우 등 특정 상황에 삭제된다. In other words, the equivalent PLMN is a PLMN that the terminal treats as a registered PLMN in the PLMN selection, cell selection / reselection process. Taking the LTE system as an example, the terminal delivers an equivalent PLMN list from the network in the process of attach, mixed attach, tracking area update, and mixed combined area update (TAU). Receive or update the list of equivalent PLMNs already received. The terminal stores the received equivalent PLMN list and the registered PLMN registered by the terminal together in the terminal. The list stored in the terminal continues to be stored even when the terminal is turned off, and when the terminal is turned on, the list is used for PLMN selection and cell selection. The list stored in the terminal is deleted in a specific situation, such as when the USIM (Universal Subscriber Identity Module) of the terminal is removed or the terminal makes an emergency call connection.
어태치 과정은 단말이 네트워크에 접속하는 과정이며, 혼합된 어태치 과정은 단말이 패킷 서비스(PS; Packet Service) 네트워크와 CS (Circuit Service) 네트워크에 동시에 접속하는 과정이다. TAU(Tracking area update) 과정은 단말이 자신이 위치한 TA (Tracking Area) 가 변경된 경우 또는 특정 이벤트가 발생한 경우 이를 네트워크에 등록하는 과정이며, 혼합된 TAU 과정은 단말이 자신이 위치한 TA (Tracking Area) 가 변경된 경우 이를 PS 네트워크와 CS 네트워크에 동시에 등록하는 과정이다. The attach process is a process in which a terminal accesses a network, and the mixed attach process is a process in which a terminal simultaneously accesses a packet service (PS) network and a circuit service (CS) network. The tracking area update (TAU) process is a process in which a terminal changes its own tracking area (TA) or when a specific event occurs, and registers it in the network, and the mixed TAU process is a tracking area (TA) in which the terminal is located. If is changed, it is a process of registering it to PS network and CS network at the same time.
기존 동등한 PLMN리스트는 단말이 받고자 하는 서비스와 관계없이 사업자 정책에 의해 기 정해져서 단말에게 전달되는 형태였다. 그러나, 동등한 PLMN 리스트에 속해있는 PLMN들이 모두 같은 서비스를 제공하지 않는 경우가 있다. 예를 들어, 동등한 PLMN 리스트에 속해있는 PLMN 중 일부만 VoIP(Voice over Internet Protocol) 서비스 (예: VoLTE(Voice over Long Term Evolution)를 제공하는 경우가 있다. 그러나, 단말은 CS 음성호 서비스보다 VoIP 음성호 서비스 사용을 선호하거나, VoIP 음성호 서비스만을 지원할 수도 있다. 또한, 동일 PLMN 내에서도 일부의 eNB(evolved node B; 기지국)만 VoIP 음성호 서비스를 지원하는 경우가 있다. 이 경우, 단말에게 전달되는 동등한 PLMN 리스트가 단순히 사업자의 로밍 계약으로 이루어져 있어서, 상기 단말의 서비스 선호도/지원여부와 eNB의 서비스 지원여부를 반영하고 있지 않으면, 단말은 서비스 제공을 받을 수 없게 된다. Previously, the equivalent PLMN list was a form defined by an operator policy and delivered to the terminal regardless of the service the terminal wanted to receive. However, there are cases where all PLMNs in the equivalent PLMN list do not provide the same service. For example, only some of the PLMNs belonging to the equivalent PLMN list may provide Voice over Internet Protocol (VoIP) services (eg, Voice over Long Term Evolution (VOLTE)). However, the terminal may use VoIP voice over CS voice call service. In some cases, only a part of an evolved node B (eNB) supports the VoIP voice call service even in the same PLMN. Since the equivalent PLMN list simply consists of a roaming contract of the operator, the terminal cannot receive service unless the terminal reflects the service preference / support of the terminal and the service support of the eNB.
도 1은 PLMN1에 위치한 단말(UE; User Equipment)이 PLMN2, PLMN3의 서비스 제공 지역으로 이동한 경우의 예시도이다.FIG. 1 is an exemplary diagram when a UE (UE) located in PLMN1 moves to a service providing area of PLMN2 and PLMN3.
단말(UE)은 VoLTE를 지원하며, CS음성호 보다 VoLTE 사용을 선호한다. 도 1의 시스템에는 세 개의 PLMN(PLMN1, PLMN2, PLMN3)이 예시된다. 단말(UE)의 등록된 PLMN은 PLMN1이다. PLMN1은 VoLTE를 지원하며, PLMN2는 VoLTE를 지원하지 않으며, PLMN3은 VoLTE를 지원한다. 기존 방안에 따르면, MME(Mobility Management Entity; 이동성 관리 엔터티)는 동등한 PLMN 리스트 생성시 단말(UE)의 VoLTE 선호 여부를 반영하지 않기 때문에, PLMN1의 동등한 PLMN 리스트에는 PLMN2, PLMN3이 포함될 수 있다. 이 경우, 단말(UE)이 PLMN 및/또는 셀 선택이 필요한 경우, 단말(UE)은 동등한 PLMN 리스트내의 PLMN을 임의로 선택하기 때문에 VoLTE를 지원하지 않는 PLMN2를 선택할 수도 있다. 이 경우, 단말(UE)은 단말(UE)이 지원하거나 선호하는 방식으로 음성 서비스를 받지 못할 수도 있다.The UE supports VoLTE and prefers to use VoLTE over CS voice calls. Three PLMNs (PLMN1, PLMN2, PLMN3) are illustrated in the system of FIG. The registered PLMN of the UE is PLMN1. PLMN1 supports VoLTE, PLMN2 does not support VoLTE, and PLMN3 supports VoLTE. According to the existing scheme, since the MME (Mobility Management Entity) does not reflect whether the UE (UE) prefers VoLTE when generating the equivalent PLMN list, the PLMN2 and PLMN3 may be included in the equivalent PLMN list of the PLMN1. In this case, when the UE UE needs to select a PLMN and / or a cell, the UE may select a PLMN2 that does not support VoLTE because the UE arbitrarily selects a PLMN in the equivalent PLMN list. In this case, the UE may not receive voice service in a manner supported or preferred by the UE.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 특정 서비스를 선호하는 단말이 특정 서비스를 지원하는 PLMN을 선택할 수 있도록 하는 방안에 대한 것이다. The present invention has been made to solve the above problems, and relates to a method for allowing a terminal that prefers a specific service to select a PLMN supporting a specific service.
좀 더 구체적으로, VoLTE를 지원/선호하는 단말이 PLMN/셀 선택을 수행하는 경우, VoLTE를 지원하는 PLMN/셀을 우선적으로 선택할 수 있도록 하는 방안에 대한 것이다.More specifically, the present invention relates to a method of preferentially selecting a PLMN / cell supporting VoLTE when a UE supporting / prefering VoLTE performs PLMN / cell selection.
상술한 문제점을 해결하기 위하여, 본 발명의 일 실시 예에 따르는 이동성 관리 엔터티(MME; Mobility Management Entity)의 PLMN 리스트 제공 방법은, 단말로부터 요청을 수신하는 단계, 상기 요청을 기초로 상기 단말이 VoLTE(Voice over Long Term Evolution)을 선호하는지 판단하는 단계 및 상기 단말이 상기 VoLTE를 선호하는 경우 각 PLMN이 상기 VoLTE를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 송신하는 단계를 포함할 수 있다.In order to solve the above-described problem, a method for providing a PLMN list of a mobility management entity (MME) according to an embodiment of the present invention, receiving a request from a terminal, the terminal based on the request VoLTE Determining whether to prefer Voice over Long Term Evolution, and when the UE prefers the VoLTE, a modified equivalent PLMN list including information on whether each PLMN supports the VoLTE, or supporting the VoLTE The method may include transmitting a VoLTE supported PLMN list including only the PLMN.
상술한 문제점을 해결하기 위하여, 본 발명의 일 실시 예에 따르는 단말(UE; User Equipment)의 동등한(equivalent) PLMN(Public Land Mobile Network) 선택 방법은, 각 PLMN이 상기 VoLTE(Voice over Long Term Evolution)를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 수신하는 단계 및 상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 기초로 상기 VoLTE를 지원하는 동등한 PLMN을 선택하는 단계를 포함할 수 있다.In order to solve the above problems, a method of selecting an equivalent Public Land Mobile Network (PLMN) of a user equipment (UE) according to an embodiment of the present invention, wherein each PLMN is Voice over Long Term Evolution (VOLTE) Receiving a modified equivalent PLMN list including information on whether or not the information is supported, or a VoLTE supported PLMN list including only the PLMNs supporting the VoLTE, and based on the modified equivalent PLMN list or the VoLTE supported PLMN list. And selecting an equivalent PLMN supporting the VoLTE.
상술한 문제점을 해결하기 위하여, 본 발명의 일 실시 예에 따르는 기지국(eNB; evolved Node B)의 동등한(equivalent) PLMN(Public Land Mobile Network) 선택 방법은, 각 PLMN이 상기 VoLTE(Voice over Long Term Evolution)를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 수신하는 단계, VoLTE를 선호하는 단말을 위한 PLMN 선택이 필요하다면, 상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 기초로 상기 VoLTE를 지원하는 동등한 PLMN을 선택하는 단계 및 상기 선택된 PLMN에 상응하는 타겟 기지국에게 핸드오버 필요 메시지(Handover required message)를 송신하는 단계를 포함할 수 있다.In order to solve the above-described problem, an equivalent Public Land Mobile Network (PLMN) selection method of an evolved Node B (eNB) according to an embodiment of the present invention, each PLMN is the Voice over Long Term Receiving a modified equivalent PLMN list including information on whether or not to support Evolution), or a VoLTE-supported PLMN list including only the PLMNs supporting the VoLTE, if a PLMN selection is required for the UE that prefers VoLTE, Selecting an equivalent PLMN supporting the VoLTE based on the modified equivalent PLMN list or the VoLTE supported PLMN list and transmitting a handover required message to a target base station corresponding to the selected PLMN. It may include.
상술한 문제점을 해결하기 위하여, 본 발명의 일 실시 예에 따르는 PLMN(Public Land Mobile Network) 리스트를 제공하는 이동성 관리 엔터티(MME; Mobility Management Entity)는 단말로부터 요청을 수신하는 통신부 및 상기 요청을 기초로 상기 단말이 VoLTE(Voice over Long Term Evolution)을 선호하는지 판단하는 단계를 포함할 수 있다. 상기 통신부는 상기 단말이 상기 VoLTE를 선호하는 경우 각 PLMN이 상기 VoLTE를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 송신할 수 있다.In order to solve the above problems, a mobility management entity (MME) providing a Public Land Mobile Network (PLMN) list according to an embodiment of the present invention is based on a communication unit that receives a request from a terminal and the request. The method may include determining whether the UE prefers Voice over Long Term Evolution (VOLTE). When the terminal prefers the VoLTE, the communication unit may transmit a modified equivalent PLMN list including information on whether each PLMN supports the VoLTE, or a VoLTE support PLMN list including only the PLMN supporting the VoLTE. Can be.
상술한 문제점을 해결하기 위하여, 본 발명의 일 실시 예에 따르는 동등한(equivalent) PLMN(Public Land Mobile Network)을 선택하는 단말(UE; User Equipment)은, 각 PLMN이 상기 VoLTE(Voice over Long Term Evolution)를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 수신하는 통신부 및 상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 기초로 상기 VoLTE를 지원하는 동등한 PLMN을 선택하는 제어부를 포함할 수 있다.In order to solve the above problems, a user equipment (UE) for selecting an equivalent Public Land Mobile Network (PLMN) according to an embodiment of the present invention, each PLMN is the Voice over Long Term Evolution (VOLTE) Communication unit for receiving a modified equivalent PLMN list including information on whether or not the information is supported, or a VoLTE supported PLMN list including only the PLMN supporting the VoLTE, and the modified equivalent PLMN list or the VoLTE supported PLMN list. The controller may include a controller for selecting an equivalent PLMN supporting the VoLTE.
상술한 문제점을 해결하기 위하여, 본 발명의 일 실시 예에 따르는 동등한(equivalent) PLMN(Public Land Mobile Network)을 선택하는 기지국(eNB; evolved Node B)은, 각 PLMN이 상기 VoLTE(Voice over Long Term Evolution)를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 수신하는 통신부 및 VoLTE를 선호하는 단말을 위한 PLMN 선택이 필요하다면, 상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 기초로 상기 VoLTE를 지원하는 동등한 PLMN을 선택하는 제어부를 포함할 수 있다. 상기 통신부는 상기 선택된 PLMN에 상응하는 타겟 기지국에게 핸드오버 필요 메시지(Handover required message)를 송신할 수 있다.In order to solve the above-described problem, an evolved Node B (eNB) that selects an equivalent Public Land Mobile Network (PLMN) according to an embodiment of the present invention, each PLMN is the Voice over Long Term (VoLTE) If it is necessary to select a PLMN for a communication unit receiving a modified equivalent PLMN list including information on whether or not to support Evolution, or a VoLTE-supported PLMN list including only the PLMN supporting the VoLTE and a terminal that prefers VoLTE, It may include a control unit for selecting an equivalent PLMN supporting the VoLTE based on the modified equivalent PLMN list or the VoLTE support PLMN list. The communication unit may transmit a handover required message to a target base station corresponding to the selected PLMN.
본 발명의 일 실시 예에 따르면, VoLTE 사용을 선호하는 단말이 VoLTE를 지원하는 동등한 PLMN을 효과적으로 선택할 수 있다.According to an embodiment of the present invention, a terminal that prefers to use VoLTE may effectively select an equivalent PLMN supporting VoLTE.
도 1은 PLMN1에 위치한 단말(UE; User Equipment)이 PLMN2, PLMN3의 서비스 제공 지역으로 이동한 경우의 예시도이다.FIG. 1 is an exemplary diagram when a UE (UE) located in PLMN1 moves to a service providing area of PLMN2 and PLMN3.
도 2는 본 발명의 제1 실시 예에 따라 MME가 동등한 PLMN* 리스트를 구성하는 과정의 순서도이다.2 is a flowchart illustrating a process of forming an equivalent PLMN * list by an MME according to the first embodiment of the present invention.
도 3는 본 발명의 제1 실시 예에 따르는 동등한 PLMN* 리스트의 예시이다.3 is an illustration of an equivalent PLMN * list according to the first embodiment of the present invention.
도 4는 본 발명의 제1 실시 예에 따르는 PLMN* 리스트의 전달 과정의 순서도이다.4 is a flowchart illustrating a delivery process of a PLMN * list according to a first embodiment of the present invention.
도 5는 본 발명의 제2 실시 예에 따르는 VoLTE 지원 PLMN 리스트의 예시도이다. 5 is an exemplary diagram of a VoLTE support PLMN list according to a second embodiment of the present invention.
도 6은 본 발명의 제3 실시 예에 따르는 UE의 PLMN/셀 선택 과정의 순서도이다. 6 is a flowchart illustrating a PLMN / cell selection process of the UE according to the third embodiment of the present invention.
도 7은 본 발명의 제4 실시 예에 따르는 eNB의 PLMN/셀 선택 과정의 순서도이다. 7 is a flowchart illustrating a PLMN / cell selection process of an eNB according to a fourth embodiment of the present invention.
도 8은 본 발명의 일 실시 예에 따르는 단말(401)의 블록구성도이다.8 is a block diagram of a terminal 401 according to an embodiment of the present invention.
도 9는 본 발명의 일 실시 예에 따르는 eNB(또는 기지국)(402)의 블록구성도이다.9 is a block diagram of an eNB (or base station) 402 according to an embodiment of the present invention.
도 10은 본 발명의 일 실시 예에 따르는 MME(403)의 블록구성도이다.10 is a block diagram of an MME 403 according to an embodiment of the present invention.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예들을 상세히 설명한다. 이 때, 본 발명의 요지를 흐리게 할 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략할 것이다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, detailed descriptions of well-known functions and configurations that may blur the gist of the present invention will be omitted.
또한, 본 발명의 실시 예들을 구체적으로 설명함에 있어서, EPS (Evolved Packet System)을 주된 대상으로 할 것이지만, 본 발명의 주요한 요지는 유사한 기술적 배경을 가지는 여타의 통신 시스템에도 본 발명의 범위를 크게 벗어나지 아니하는 범위에서 약간의 변형으로 적용 가능하며, 이는 본 발명의 기술 분야에서 숙련된 기술적 지식을 가진 자의 판단으로 가능할 것이다. In addition, in describing the embodiments of the present invention in detail, the main subject will be the Evolved Packet System (EPS), but the main subject matter of the present invention does not significantly depart from the scope of the present invention in other communication systems having a similar technical background. It can be applied to a slight modification in the range that is not, to the judgment of those skilled in the art of the present invention.
본 발명의 제1 실시 예에 따르면, MME는 동등한 PLMN 리스트를 구성할 때, 단말의 VoLTE 선호도와 eNB의 VoLTE 지원여부를 고려하여, 본 발명의 제1 실시 예에 따르는 동등한 PLMN리스트을 구성한다.According to the first embodiment of the present invention, when the MME constructs the equivalent PLMN list, the MME constructs the equivalent PLMN list according to the first embodiment of the present invention in consideration of the VoLTE preference of the UE and the VoLTE support of the eNB.
본 발명의 제1 실시 예에 따르는 동등한 PLMN 리스트는 각 PLMN이 VoLTE를 지원하는지 여부를 포함한다. 상기 본 발명의 제1 실시 예에 따르는 동등한 PLMN 리스트는 이하에서 동등한 PLMN* 리스트(asterisk 추가) 또는 제1 변형 PLMN 리스트라고 지칭된다. The equivalent PLMN list according to the first embodiment of the present invention includes whether each PLMN supports VoLTE. The equivalent PLMN list according to the first embodiment of the present invention is hereinafter referred to as the equivalent PLMN * list (asterisk addition) or the first modified PLMN list.
MME는 상기 생성한 동등한 PLMN* 리스트를 eNB와 UE에게 전달한다. The MME delivers the generated equivalent PLMN * list to the eNB and the UE.
본 발명의 두 번째 실시 예에 따르면, MME는 동등한 PLMN 리스트와 별개로 단말의 VoLTE 선호도와 eNB의 VoLTE 지원여부를 고려하여, 본 발명의 제2 실시 예에 따르는 VoLTE 지원(supported) PLMN 리스트를 생성하는 것을 제안한다. 또한 MME가 상기 생성한 VoLTE 지원 PLMN 리스트를 eNB와 UE에게 전달한다.According to the second embodiment of the present invention, the MME generates a VoLTE supported PLMN list according to the second embodiment of the present invention in consideration of the VoLTE preference of the UE and the VoLTE support of the eNB separately from the equivalent PLMN list. Suggest to do. In addition, the MME delivers the generated VoLTE support PLMN list to the eNB and the UE.
본 발명의 세 번째 실시 예에 따르면, VoLTE를 선호하는 UE는 PLMN를 선택할 때, 상기 전달받은 동등한 PLMN* 리스트 또는 VoLTE 지원 PLMN 리스트 내의 PLMN 중 VoLTE를 지원하는 PLMN을 선택한다. 상기 PLMN 선택은 상기 PLMN에 속한 셀을 선택하는 것을 포함할 수 있다. According to the third embodiment of the present invention, when a PLMN is preferred, a UE that prefers VoLTE selects a PLMN that supports VoLTE among PLMNs in the received equivalent PLMN * list or VoLTE support PLMN list. The PLMN selection may include selecting a cell belonging to the PLMN.
본 발명의 네 번째 실시 예에 따르면, VoLTE를 선호하는 UE가 핸드오버하는 경우, 소스(source) eNB는 상기 전달받은 동등한 PLMN* 리스트 또는 VoLTE 지원 PLMN 리스트 내의 PLMN 중 VoLTE를 지원하는 PLMN을 선택한다. 상기 PLMN 선택은 소스 eNB가 상기 PLMN에 속한 셀을 타겟 셀(target cell)로서 선택하는 것을 포함할 수 있다. 상기 PLMN 선택은 소스 eNB가 상기 PLMN에 속한 셀을 관리하는 eNB를 타겟 eNB로 선택하는 것을 포함할 수 있다. According to the fourth embodiment of the present invention, when a UE that prefers VoLTE hands over, the source eNB selects a PLMN that supports VoLTE among the PLMNs in the received equivalent PLMN * list or the VoLTE support PLMN list. . The PLMN selection may include a source eNB selecting a cell belonging to the PLMN as a target cell. The PLMN selection may include a source eNB selecting an eNB managing a cell belonging to the PLMN as a target eNB.
도 2는 본 발명의 제1 실시 예에 따라 MME가 동등한 PLMN* 리스트를 구성하는 과정의 순서도이다.2 is a flowchart illustrating a process of forming an equivalent PLMN * list by an MME according to the first embodiment of the present invention.
단계 210에서 MME는 단말(UE)로부터 요청을 수신한다. 상기 요청은 예를 들어 어태치 요청, 혼합된 어태치 요청, TAU 요청 및 혼합된 TAU 요청 중 어느 하나 이상을 포함할 수 있다. In step 210, the MME receives a request from a UE. The request may include, for example, any one or more of an attach request, a mixed attach request, a TAU request, and a mixed TAU request.
단계 220에서 MME는 상기 요청을 송신한 단말이 VoLTE를 선호하는지 확인한다. 예를 들어 상기 요청에 단말이 VoLTE를 선호한다는 정보가 포함되어 있다면 상기 요청을 송신한 단말이 VoLTE를 선호하는 것으로 확인할 수 있다. 예를 들어 MME는 단말이 전송하는 '음성 영역 선호 및 단말의 사용 설정(Voice domain preference and UE's usage setting)'을 통해서 단말의 선호 정보를 확인할 수 있다.In step 220, the MME checks whether the terminal that sent the request prefers VoLTE. For example, if the request includes information indicating that the UE prefers VoLTE, it can be confirmed that the UE transmitting the request prefers VoLTE. For example, the MME may check the preference information of the terminal through 'Voice domain preference and UE's usage setting' transmitted by the terminal.
단말이 VoLTE를 선호하는 경우, 과정은 단계 단계 230으로 진행한다. 단계 230에서 MME는 상기 단말에 상응하는 eNB가 VoLTE를 지원하는지 여부를 확인한다. 상기 확인은 UE 'Radio Capability Match' 과정을 통해 수행될 수 있다. 변형 예에 따르면 모든 eNB가 VoLTE를 지원하는 것으로 가정하고 단계 230은 생략될 수도 있다.If the terminal prefers VoLTE, the process proceeds to step 230. In step 230, the MME checks whether an eNB corresponding to the terminal supports VoLTE. The confirmation may be performed through a UE 'Radio Capability Match' process. According to a variant, it is assumed that all eNBs support VoLTE and step 230 may be omitted.
eNB가 VoLTE를 지원하는 경우, 과정은 단계 240으로 진행한다. 단계 240에서 MME는 VoLTE 지시자를 포함하는 동등한 PLMN* 리스트를 생성한다. If the eNB supports VoLTE, the process proceeds to step 240. In step 240, the MME creates an equivalent PLMN * list that includes the VoLTE indicator.
단계 220의 판단 결과 UE가 VoLTE를 선호하지 않는 경우 과정은 단계 250으로 진행한다. 단말이 VoLTE를 선호하지 않는 경우도 마찬가지로 과정은 단계 250으로 진행한다. 단계 250에서 MME는 VoLTE 고려 없이 기존의 방법으로 동등한 PLMN 리스트를 생성한다. If it is determined in step 220 that the UE does not prefer VoLTE, the process proceeds to step 250. Similarly, if the UE does not prefer VoLTE, the process proceeds to step 250. In step 250, the MME generates an equivalent PLMN list in the existing method without considering VoLTE.
도 3는 본 발명의 제1 실시 예에 따르는 동등한 PLMN* 리스트의 예시이다.3 is an illustration of an equivalent PLMN * list according to the first embodiment of the present invention.
본 발명의 제1 실시 예에 따르면, 동등한 PLMN* 리스트는 동등한 PLMN* 리스트 내의 각 PLMN이 VoLTE를 지원하는 지 여부를 포함한다. 상기 지원 여부는 본 발명의 제1 실시 예에 따르는 'PLMN에 대한 VoLTE 지원 지시자(VoLTE support indicator for PLMN)' 지시자 및/또는 필드를 통해 지시될 수 있다. PLMN에 대한 VoLTE 지원 지시자는 1 비트 지시자로 구성될 수 있다. 이 경우 PLMN이 VoLTE를 지원하는 경우 1, VoLTE를 지원하지 않는 경우 0으로 설정할 수 있다. 변형 예에 따르면 PLMN에 대한 VoLTE 지원 지시자는 다른 정보와 함께 결합되어 표현되거나 2 이상의 비트를 점유할 수도 있다. 또한 다른 변형 예에 따르면 PLMN에 대한 VoLTE 지원 지시자는 PLMN이 VoLTE를 지원하는 경우 0, VoLTE를 지원하지 않는 경우 1과 같은 형태로 반대로 사용될 수도 있다.According to the first embodiment of the present invention, the equivalent PLMN * list includes whether each PLMN in the equivalent PLMN * list supports VoLTE. The support may be indicated through a 'VoLTE support indicator for PLMN' indicator and / or a field according to the first embodiment of the present invention. The VoLTE support indicator for the PLMN may consist of a 1 bit indicator. In this case, it can be set to 1 if the PLMN supports VoLTE or 0 if it does not support VoLTE. According to a variant, the VoLTE support indicator for the PLMN may be expressed in conjunction with other information or occupy two or more bits. According to another variation, the VoLTE support indicator for the PLMN may be used in the reverse form, such as 0 when the PLMN supports VoLTE and 1 when the PLMN does not support VoLTE.
도 4는 본 발명의 제1 실시 예에 따르는 PLMN* 리스트의 전달 과정의 순서도이다. 도 4의 예에서 어태치 과정 중 PLMN* 리스트가 전달되는 것을 예시하였다. 변형 예에 따르면 어태치 과정 외에 다른 종류의 과정 도중, 또는 별도의 과정으로 PLMN* 리스트가 전달될 수도 있다. 도 4의 예시에서 어태치 과정 중 본 실시 예와 직접적으로 관련이 없는 과정은 생략되었음을 밝힌다. 4 is a flowchart illustrating a delivery process of a PLMN * list according to a first embodiment of the present invention. In the example of FIG. 4, the PLMN * list is transmitted during the attach process. According to a variant, the PLMN * list may be delivered during other types of processes besides the attach process or as a separate process. In the example of FIG. 4, the attach process is not directly related to the present embodiment.
단계 410에서 단말(401)은 네트워크의 MME(403)에게 어태치 요청을 보낸다. 이 때, 어태치 요청은 단말(401)의 VoLTE 선호도(선호 정보, 선호 지시자)를 포함할 수 있다. 상기 VoLTE 선호도는 기 존재하는 '음성 영역 선호 및 단말의 사용 설정(Voice domain preference and UE's usage setting)'을 통해서 지시될 수도 있다. 변형 예에 따르면 VoLTE 선호도를 나타내는 새로운 파라미터가 추가될 수도 있다. In step 410, the terminal 401 sends an attach request to the MME 403 of the network. At this time, the attach request may include a VoLTE preference (preferred information, preference indicator) of the terminal 401. The VoLTE preference may be indicated through the existing 'Voice domain preference and UE's usage setting'. According to a modification, a new parameter indicating VoLTE preference may be added.
단계 420에서 MME(403)는 상기 단말(401)에 해당하는 eNB(402)에게 UE 무선 성능 매치 요청(UE Radio Capability Match request)을 송신한다. 단계 430에서 MME(403)는 eNB(402)로부터 UE 무선 성능 매치 응답(UE Radio Capability Match response)을 수신한다. 단계 420 및 단계 430의 과정을 통틀어 UE 무선 성능 매치(UE Radio Capability match) 과정이라고 칭한다. MME(403)는 기 존재하는 UE 무선 성능 매치 과정을 통해 eNB(402)가 VoLTE를 지원하는지 여부를 확인한다. 동일 PLMN에 속하는 eNB 중에서도 일부 eNB는 VoLTE를 지원하고 나머지 eNB는 VoLTE를 지원하지 못할 수 있기 때문에, 상기 확인 과정이 필요할 수 있다. 상기 UE 무선 성능 매치 과정은 MME(403)가 eNB(402)의 무선 성능(Radio capability)를 확인하는 과정이다. In step 420, the MME 403 transmits a UE radio capability match request to the eNB 402 corresponding to the terminal 401. In step 430, the MME 403 receives a UE Radio Capability Match response from the eNB 402. The process of steps 420 and 430 is referred to as a UE radio capability match process. The MME 403 checks whether the eNB 402 supports VoLTE through an existing UE radio performance matching process. Among the eNBs belonging to the same PLMN, some of the eNBs support VoLTE and the other eNBs may not support VoLTE. The UE radio capability matching process is a process in which the MME 403 confirms radio capability of the eNB 402.
단계 440에서 MME는 단계 410에서 받은 단말(401)의 선호도와 eNB(402)의 VoTLE 지원여부를 고려하여, 동등한 PLMN* 리스트, 또는 동등한 PLMN 리스트를 생성한다. 어떠한 리스트를 생성하는지에 대한 구체적인 판단 과정은 도 2를 참조하여 상술한 바와 같다. 여기서는 MME(403)가 동등한 PLMN* 리스트를 생성한다고 가정한다.In step 440, the MME generates an equivalent PLMN * list or an equivalent PLMN list in consideration of the preference of the terminal 401 received in step 410 and the VoTLE support of the eNB 402. A detailed determination process for generating a list is as described above with reference to FIG. 2. It is assumed here that the MME 403 generates an equivalent PLMN * list.
단계 450에서 MME(403)는 어태치 허용(Attach Accept)/초기 컨텍스트 셋업 요청(Initial context setup request) 메시지를 eNB(402)에게 송신한다. 어태치 허용/초기 컨텍스트 셋업 요청 메시지는 동등한 PLMN* 리스트를 포함한다. 초기 컨텍스트 셋업 요청/응답 과정은 MME(403)가 단말(401)에 대한 컨텍스트(context)를 eNB(402)에게 전달하는 과정이다. In step 450, the MME 403 sends an Attach Accept / Initial context setup request message to the eNB 402. The attach allow / initial context setup request message contains an equivalent PLMN * list. The initial context setup request / response process is a process in which the MME 403 delivers a context for the terminal 401 to the eNB 402.
단계 460에서 eNB(402)는 단계 450에서 수신한 동등한 PLMN* 리스트(즉, VoLTE 지원 여부 정보 포함하는 리스트)를 저장한다. In step 460 the eNB 402 stores the equivalent PLMN * list (ie, a list including the VoLTE support information) received in step 450.
단계 470에서 eNB(402)는 단계 450에서 수신한 어태치 허용 메시지를 단말(401)에게 전달한다. 상기 어태치 허용 메시지는 동등한 PLMN* 리스트를 포함한다. In operation 470, the eNB 402 transmits the attach permission message received in operation 450 to the terminal 401. The attach allow message includes an equivalent PLMN * list.
단계 480에서 eNB(402)는 초기 컨텍스트 셋업 응답(Initial Context setup response) 메시지를 MME(403)에게 전송한다. In step 480, the eNB 402 transmits an initial context setup response message to the MME 403.
변형 예에 따르면 단말(401)은 도 4를 통해 설명한 어태치 과정 외에도, TAU 과정을 통해 동등한 PLMN* 리스트를 전달받을 수 있다. TAU 과정을 통해 변경된 동등한 PLMN* 리스트가 전달되는 경우, MME(403)는 별도의 시그널링 메시지를 통해 eNB(402)에게 변경된 동등한 PLMN* 리스트를 전달할 수 있다. According to a modification, the terminal 401 may receive an equivalent PLMN * list through the TAU process in addition to the attach process described with reference to FIG. 4. When the changed equivalent PLMN * list is delivered through the TAU process, the MME 403 may deliver the changed equivalent PLMN * list to the eNB 402 through a separate signaling message.
도 5는 본 발명의 제2 실시 예에 따르는 VoLTE 지원 PLMN 리스트의 예시도이다. 5 is an exemplary diagram of a VoLTE support PLMN list according to a second embodiment of the present invention.
MME는 VoLTE를 선호하는 단말에게 기존의 동등한 PLMN 리스트를 전달할 뿐만 아니라, 추가로 VoLTE 지원 PLMN 리스트를 전달할 수 있다. 상기 VoLTE 지원 PLMN 리스트의 전달은 기존의 동등한 PLMN 리스트를 전달하는 과정에서 이루어질 수도 있으며, 독립적인 NAS(Non-Access Stratum) 또는 S1-AP(S1 Application Protocol) 과정을 통해 이루어질 수도 있다. 상기 NAS는 단말과 MME 사이의 메시지 전송 프로토콜이며, S1-AP는 eNB와 MME 사이의 메시지 전송 프로토콜이다. VoLTE 지원 PLMN 리스트는 오직 VoLTE를 지원하는 PLMN만을 포함하는 리스트이다.The MME not only delivers an existing equivalent PLMN list to UEs that prefer VoLTE, but can also additionally deliver VoLTE-supported PLMN lists. The delivery of the VoLTE-supported PLMN list may be performed in a process of delivering an existing equivalent PLMN list, or may be performed through an independent non-access stratum (NAS) or S1 application protocol (S1-AP) process. The NAS is a message transmission protocol between the terminal and the MME, and S1-AP is a message transmission protocol between the eNB and the MME. The VoLTE Support PLMN List is a list containing only PLMNs that support VoLTE.
도 6은 본 발명의 제3 실시 예에 따르는 UE의 PLMN/셀 선택 과정의 순서도이다. 6 is a flowchart illustrating a PLMN / cell selection process of the UE according to the third embodiment of the present invention.
단말은 제 1실시 예에서 설명한 바와 같이, MME로부터 전달받은 동등한 PLMN* 리스트를 저장하고 있거나 제2 실시 예에서 설명한 바와 같이 VoLTE 지원 PLMN 리스트를 저장하고 있다. 도 6에 따르면, 단계 610에서 VoLTE를 선호하는 단말이 PLMN 및/또는 셀 선택이 필요하다고 결정한다. 단계 620에서 UE는 VoLTE를 지원하는 동등한 PLMN이 존재하는지 판단한다. 이러한 판단을 위해 제1 실시 예의동등한 PLMN* 리스트 또는 제2 실시 예의 VoLTE 지원 PLMN 리스트가 활용될 수 있다. 이러한 리스트를 기반으로 판단한 결과 VoLTE를 지원하는 동등한 PLMN이 존재하는 경우, 과정은 단계 640으로 진행한다. 단계 640에서 단말은 상기 VoLTE를 지원하는 PLMN 및/또는 셀을 선택한다. VoLTE를 지원하는 동등한 PLMN이 존재하지 않는 경우, 과정은 단계 630으로 진행하고, 단계 630 단말은 임의의 동등한 PLMN 및/또는 셀을 선택한다. As described in the first embodiment, the terminal stores the equivalent PLMN * list received from the MME or the VoLTE support PLMN list as described in the second embodiment. According to FIG. 6, in step 610, the UE that prefers VoLTE determines that PLMN and / or cell selection is required. In step 620, the UE determines whether there is an equivalent PLMN supporting VoLTE. For this determination, the equivalent PLMN * list of the first embodiment or the VoLTE support PLMN list of the second embodiment may be utilized. If it is determined based on this list that there is an equivalent PLMN supporting VoLTE, the process proceeds to step 640. In step 640, the UE selects a PLMN and / or a cell supporting the VoLTE. If there is no equivalent PLMN supporting VoLTE, the process proceeds to step 630, where the terminal 630 selects any equivalent PLMN and / or cell.
단말이 VoLTE 지원 PLMN 리스트를 보유한 경우, 단말은 PLMN/셀 선택 과정에서 VoLTE 지원 PLMN 리스트를 우선적으로 확인할 수도 있다. If the UE has a VoLTE support PLMN list, the UE may preferentially check the VoLTE support PLMN list in the PLMN / cell selection process.
도 7은 본 발명의 제4 실시 예에 따르는 eNB의 PLMN/셀 선택 과정의 순서도이다. 7 is a flowchart illustrating a PLMN / cell selection process of an eNB according to a fourth embodiment of the present invention.
eNB는 제1 실시 예를 참조하여 설명한 바와 같이, MME로부터 전달받은 동등한 PLMN* 리스트를 저장하고 있거나 제2 실시 예를 참조하여 설명한 바와 같은 VoLTE 지원 PLMN 리스트를 저장하고 있다. 도 7에 따르면, 단계 710에서 소스 eNB는 PLMN 및/또는 셀 선택이 필요하다고 결정한다. 단계 720에서 상기 eNB는 상기 전달받은 동등한 PLMN* 리스트 또는 VoLTE 지원 PLMN 리스트를 기반으로 VoLTE를 지원하는 동등한 PLMN이 존재하는지 확인한다. VoLTE를 지원하는 동등한 PLMN이 존재하는 경우, 과정은 단계 740으로 진행하고, 단계 740에서 eNB는 VoLTE를 지원하는 PLMN 및/또는 셀을 선택한다. VoLTE를 지원하는 동등한 PLMN이 존재하지 않는 경우, 과정은 단계 730으로 진행하고, 단계 730에서 eNB는 임의의 동등한 PLMN 및/또는 셀을 선택한다.As described with reference to the first embodiment, the eNB stores the equivalent PLMN * list received from the MME or the VoLTE support PLMN list as described with reference to the second embodiment. According to FIG. 7, at step 710, the source eNB determines that PLMN and / or cell selection is required. In step 720, the eNB checks whether there is an equivalent PLMN supporting VoLTE based on the received equivalent PLMN * list or VoLTE support PLMN list. If there is an equivalent PLMN that supports VoLTE, the process proceeds to step 740 where the eNB selects the PLMN and / or cell that supports VoLTE. If there is no equivalent PLMN supporting VoLTE, the process proceeds to step 730 where the eNB selects any equivalent PLMN and / or cell.
상기 PLMN/셀 선택 과정은 소스 eNB가 상기 PLMN에 속한 셀을 타겟 셀로서 선택하는 과정을 포함할 수 있다. 또한 상기 PLMN 선택 과정은 소스 eNB가 상기 PLMN에 속한 셀을 관리하는 eNB를 타겟 eNB로서 선택하는 과정을 포함할 수 있다. The PLMN / cell selection process may include a process of a source eNB selecting a cell belonging to the PLMN as a target cell. In addition, the PLMN selection process may include a process in which a source eNB selects an eNB managing a cell belonging to the PLMN as a target eNB.
단계 750에서 상기 eNB는 핸드오버 필요 메시지(HandOver required message)를 선택된 PLMN 및/또는 셀을 지원하는 타겟 eNB에게 전달한다.In step 750, the eNB delivers a HandOver required message to the target eNB supporting the selected PLMN and / or cell.
도 8은 본 발명의 일 실시 예에 따르는 단말(401)의 블록구성도이다. 도 8을 참조하면, 단말(401)은 통신부(810) 및 제어부(820)를 포함한다. 단말(401)의 기타 구성부 중 본 발명의 실시 예들과 직접적인 관련이 없는 부분은 생략되었다. 제어부(820)는 상술한 실시 예들 중 어느 하나에 따라 단말(401)이 PLMN을 선택하도록 단말(401)을 제어한다. 예를 들어 제어부(820)는 도 6을 참조하여 설명한 과정을 위한 판단/제어를 수행할 수 있다. 통신부(810)는 상술한 실시 예들 중 어느 하나를 실시하기 위해 필요한 신호를 송수신한다.8 is a block diagram of a terminal 401 according to an embodiment of the present invention. Referring to FIG. 8, the terminal 401 includes a communication unit 810 and a control unit 820. Parts of the other components of the terminal 401 not directly related to the embodiments of the present invention are omitted. The controller 820 controls the terminal 401 to select the PLMN by the terminal 401 according to any one of the above-described embodiments. For example, the controller 820 may perform determination / control for the process described with reference to FIG. 6. The communication unit 810 transmits and receives a signal required to implement any one of the above-described embodiments.
도 9는 본 발명의 일 실시 예에 따르는 eNB(또는 기지국)(402)의 블록구성도이다. 도 8을 참조하면, eNB(402)은 통신부(910) 및 제어부(920)를 포함한다. eNB(402)의 기타 구성부 중 본 발명의 실시 예들과 직접적인 관련이 없는 부분은 생략되었다. 제어부(920)는 상술한 실시 예들 중 어느 하나에 따라 단말(401)의 핸드오버 시 eNB(402)이 PLMN을 선택하도록 eNB(402)을 제어한다. 예를 들어 제어부(920)는 도 7을 참조하여 설명한 과정을 위한 판단/제어를 수행할 수 있다. 통신부(910)는 상술한 실시 예들 중 어느 하나를 실시하기 위해 필요한 신호를 송수신한다.9 is a block diagram of an eNB (or base station) 402 according to an embodiment of the present invention. Referring to FIG. 8, the eNB 402 includes a communication unit 910 and a control unit 920. Parts of other components of the eNB 402 that are not directly related to the embodiments of the present invention are omitted. The controller 920 controls the eNB 402 so that the eNB 402 selects the PLMN during the handover of the terminal 401 according to any one of the above-described embodiments. For example, the controller 920 may perform determination / control for the process described with reference to FIG. 7. The communication unit 910 transmits and receives a signal necessary to implement any one of the above-described embodiments.
도 10은 본 발명의 일 실시 예에 따르는 MME(403)의 블록구성도이다. 도 8을 참조하면, MME(403)은 통신부(1010) 및 제어부(1020)를 포함한다. MME(403)의 기타 구성부 중 본 발명의 실시 예들과 직접적인 관련이 없는 부분은 생략되었다. 제어부(1020)는 상술한 실시 예들 중 어느 하나에 따라 단말(401)로부터 요청을 받을 때 MME(403)가 PLMN* 리스트를 생성하거나 VoLTE 지원 PLMN 리스트를 생성하도록 MME(403)을 제어한다. 예를 들어 제어부(1020)는 도 2을 참조하여 설명한 과정을 위한 판단/제어를 수행할 수 있다. 통신부(1010)는 상술한 실시 예들 중 어느 하나를 실시하기 위해 필요한 신호를 송수신한다.10 is a block diagram of an MME 403 according to an embodiment of the present invention. Referring to FIG. 8, the MME 403 includes a communication unit 1010 and a control unit 1020. Parts of the other components of the MME 403 that are not directly related to the embodiments of the present invention are omitted. The controller 1020 controls the MME 403 to generate the PLMN * list or the VoLTE support PLMN list when the MME 403 receives a request from the terminal 401 according to any one of the above-described embodiments. For example, the controller 1020 may perform determination / control for the process described with reference to FIG. 2. The communication unit 1010 transmits and receives a signal required to implement any one of the above-described embodiments.
상술한 실시 예들에서 단말의 VoLTE 선호 및 기지국/셀/PLMN의 VoLTE 지원 여부를 중심으로 설명하였다. 하지만 본원 발명의 실시 예들은 단말의 기타 선호사항 및 기지국/셀/PLMN의 상응하는 지원 여부에 대해서도 적용될 수 있다. 예를 들어 단말의 데이터 연결 시 단말이 제1 프로토콜보다 제2 프로토콜을 선호한다면 단말이 제2 프로토콜을 지원하는 기지국/셀/PLMN에 연결되도록 하기 위해 상술한 실시 예들과 유사한 방식이 적용될 수 있다.In the above-described embodiments, the description has focused on the preference of the VoLTE of the terminal and whether the base station / cell / PLMN supports the VoLTE. However, embodiments of the present invention can also be applied to other preferences of the terminal and whether the corresponding support of the base station / cell / PLMN. For example, if the terminal prefers the second protocol to the first protocol when connecting the data of the terminal, a method similar to the above-described embodiments may be applied so that the terminal is connected to the base station / cell / PLMN that supports the second protocol.
상술한 실시 예들은 컴퓨터 기타 전자 장치에서 구동 가능한 프로그램의 형태로 구현될 수 있으며, 이러한 프로그램은 저장매체에 저장될 수 있다.The above-described embodiments may be implemented in the form of a program that can be driven in a computer or other electronic device, and the program may be stored in a storage medium.

Claims (8)

  1. 이동성 관리 엔터티(MME; Mobility Management Entity)의 PLMN(Public Land Mobile Network) 리스트 제공 방법에 있어서,In the method of providing a Public Land Mobile Network (PLMN) list of a mobility management entity (MME),
    단말로부터 요청을 수신하는 단계;Receiving a request from a terminal;
    상기 요청을 기초로 상기 단말이 VoLTE(Voice over Long Term Evolution)을 선호하는지 판단하는 단계; 및Determining whether the terminal prefers Voice over Long Term Evolution (VOLTE) based on the request; And
    상기 단말이 상기 VoLTE를 선호하는 경우 각 PLMN이 상기 VoLTE를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 송신하는 단계를 포함하는 PLMN 리스트 제공 방법.If the terminal prefers the VoLTE, transmitting a modified equivalent PLMN list including information on whether each PLMN supports the VoLTE, or a VoLTE supporting PLMN list including only the PLMN supporting the VoLTE. How to provide a PLMN list.
  2. 제1항에 있어서, The method of claim 1,
    상기 단말이 상기 VoLTE를 선호하는 경우 상기 변형된 PLMN 목록, 또는 상기 VoLTE 지원 PLMN 목록을 송신하는 단계는,If the terminal prefers the VoLTE, transmitting the modified PLMN list or the VoLTE support PLMN list,
    상기 단말이 상기 VoLTE를 선호하고, 상기 단말에 상응하는 기지국이 상기 VoLTE를 지원하는 경우에, 상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 송신하는 단계를 포함하는 PLMN 리스트 제공 방법.And transmitting the modified equivalent PLMN list or the VoLTE support PLMN list when the terminal prefers the VoLTE and the base station corresponding to the terminal supports the VoLTE.
  3. 단말(UE; User Equipment)의 동등한(equivalent) PLMN(Public Land Mobile Network) 선택 방법에 있어서,In the equivalent Public Land Mobile Network (PLMN) selection method of a user equipment (UE),
    각 PLMN이 상기 VoLTE(Voice over Long Term Evolution)를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 수신하는 단계; 및Receiving a modified equivalent PLMN list including information on whether each PLMN supports the Voice over Long Term Evolution (VoLTE), or a VoLTE supported PLMN list including only PLMNs supporting the VoLTE; And
    상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 기초로 상기 VoLTE를 지원하는 동등한 PLMN을 선택하는 단계를 포함하는 PLMN 선택 방법.Selecting an equivalent PLMN supporting the VoLTE based on the modified equivalent PLMN list or the VoLTE supported PLMN list.
  4. 기지국(eNB; evolved Node B)의 동등한(equivalent) PLMN(Public Land Mobile Network) 선택 방법에 있어서, In the equivalent public land mobile network (PLMN) selection method of the evolved Node B (eNB),
    각 PLMN이 상기 VoLTE(Voice over Long Term Evolution)를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 수신하는 단계;Receiving a modified equivalent PLMN list including information on whether each PLMN supports the Voice over Long Term Evolution (VoLTE), or a VoLTE supported PLMN list including only PLMNs supporting the VoLTE;
    VoLTE를 선호하는 단말을 위한 PLMN 선택이 필요하다면, 상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 기초로 상기 VoLTE를 지원하는 동등한 PLMN을 선택하는 단계; 및 If it is necessary to select a PLMN for a UE that prefers VoLTE, selecting an equivalent PLMN supporting the VoLTE based on the modified equivalent PLMN list or the VoLTE supported PLMN list; And
    상기 선택된 PLMN에 상응하는 타겟 기지국에게 핸드오버 필요 메시지(Handover required message)를 송신하는 단계를 포함하는 PLMN 선택 방법.And transmitting a Handover required message to a target base station corresponding to the selected PLMN.
  5. PLMN(Public Land Mobile Network) 리스트를 제공하는 이동성 관리 엔터티(MME; Mobility Management Entity)에 있어서,In the Mobility Management Entity (MME) that provides a Public Land Mobile Network (PLMN) list,
    단말로부터 요청을 수신하는 통신부; 및Communication unit for receiving a request from the terminal; And
    상기 요청을 기초로 상기 단말이 VoLTE(Voice over Long Term Evolution)을 선호하는지 판단하는 단계를 포함하고,Determining whether the terminal prefers Voice over Long Term Evolution (VOLTE) based on the request;
    상기 통신부는 상기 단말이 상기 VoLTE를 선호하는 경우 각 PLMN이 상기 VoLTE를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 송신하는 것을 특징으로 하는 MME.When the terminal prefers the VoLTE, the communication unit transmits a modified equivalent PLMN list including information on whether each PLMN supports the VoLTE, or a VoLTE support PLMN list including only the PLMN supporting the VoLTE. MME, characterized in that.
  6. 제5항에 있어서, The method of claim 5,
    상기 통신부는,The communication unit,
    상기 단말이 상기 VoLTE를 선호하고, 상기 단말에 상응하는 기지국이 상기 VoLTE를 지원하는 경우에, 상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 송신하는 것을 특징으로 하는 MME.And when the terminal prefers the VoLTE and the base station corresponding to the terminal supports the VoLTE, transmitting the modified equivalent PLMN list or the VoLTE supporting PLMN list.
  7. 동등한(equivalent) PLMN(Public Land Mobile Network)을 선택하는 단말(UE; User Equipment)에 있어서,In a user equipment (UE) for selecting an equivalent public land mobile network (PLMN),
    각 PLMN이 상기 VoLTE(Voice over Long Term Evolution)를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 수신하는 통신부; 및A communication unit for receiving a modified equivalent PLMN list including information on whether each PLMN supports the Voice over Long Term Evolution (VoLTE), or a VoLTE supporting PLMN list including only the PLMNs supporting the VoLTE; And
    상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 기초로 상기 VoLTE를 지원하는 동등한 PLMN을 선택하는 제어부를 포함하는 단말.And a controller for selecting an equivalent PLMN supporting the VoLTE based on the modified equivalent PLMN list or the VoLTE support PLMN list.
  8. 동등한(equivalent) PLMN(Public Land Mobile Network)을 선택하는 기지국(eNB; evolved Node B)에 있어서, In a base station (eNB) that selects an equivalent Public Land Mobile Network (PLMN),
    각 PLMN이 상기 VoLTE(Voice over Long Term Evolution)를 지원하는지 여부에 관한 정보를 포함하는 변형된 동등한 PLMN 목록, 또는 상기 VoLTE를 지원하는 PLMN만을 포함하는 VoLTE 지원 PLMN 목록을 수신하는 통신부; 및A communication unit for receiving a modified equivalent PLMN list including information on whether each PLMN supports the Voice over Long Term Evolution (VoLTE), or a VoLTE supporting PLMN list including only the PLMNs supporting the VoLTE; And
    VoLTE를 선호하는 단말을 위한 PLMN 선택이 필요하다면, 상기 변형된 동등한 PLMN 목록 또는 상기 VoLTE 지원 PLMN 목록을 기초로 상기 VoLTE를 지원하는 동등한 PLMN을 선택하는 제어부를 포함하고,If a PLMN selection is required for a UE that prefers VoLTE, the controller includes a control unit for selecting an equivalent PLMN supporting the VoLTE based on the modified equivalent PLMN list or the VoLTE support PLMN list.
    상기 통신부는 상기 선택된 PLMN에 상응하는 타겟 기지국에게 핸드오버 필요 메시지(Handover required message)를 송신하는 것을 특징으로 하는 기지국.And the communication unit transmits a handover required message to a target base station corresponding to the selected PLMN.
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US9363720B2 (en) 2016-06-07
US9432891B2 (en) 2016-08-30
US20150382249A1 (en) 2015-12-31
KR101968586B1 (en) 2019-04-12
CN110234142A (en) 2019-09-13
KR101984147B1 (en) 2019-05-30
CN110234142B (en) 2021-09-10
US8983448B2 (en) 2015-03-17
WO2013119017A1 (en) 2013-08-15
KR20140122268A (en) 2014-10-17
EP2814287B1 (en) 2020-04-01
US9386492B2 (en) 2016-07-05
US20130203418A1 (en) 2013-08-08
US20150382247A1 (en) 2015-12-31

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